Of course, every metadata class that takes part in this would need to implement an interface that defines the getType(), e.g. based on what was retrieved from the stack advmd -> (NewInterface) propertyMetaData.getType() advmd -> (NewInterface) parameterMetaData.getType() -> (NewInterface) constructor.getType() Also, for the parameters, there would need to be some notion of "index" so you know which parameter you are working with. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3965241#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...